Prehnite, Lower New Street Quarry, Paterson, NJ

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Prehnite is a phyllosilicate of calcium and aluminum with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminum in the structure. Prehnite crystallizes in the orthorhombic crystal system. Though not a zeolite, it is found associated with minerals such as datolite, calcite, apophyllite, stilbite, laumontite, heulandite etc. in veins and cavities of basaltic rocks, sometimes in granites, syenites, or gneisses.

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Keywords: aluminum, ca2al2, calcium, crystal, crystals, exotic, inosilicate, minerals, nj, orthorhombic, paterson, phyllosilicate, prehnite, quarry, rare, rocks, specimen, specimens, street